diff --git a/CHANGELOG.md b/CHANGELOG.md
index 719bff0..edc8ae6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/google-cloud-datalabeling/#history
 
+## [1.6.3](https://github.com/googleapis/python-datalabeling/compare/v1.6.2...v1.6.3) (2022-10-07)
+
+
+### Bug Fixes
+
+* **deps:** Allow protobuf 3.19.5 ([#282](https://github.com/googleapis/python-datalabeling/issues/282)) ([6f60065](https://github.com/googleapis/python-datalabeling/commit/6f60065f8cfd790fd5e1f6ebc8f383a0c57b2ca4))
+
 ## [1.6.2](https://github.com/googleapis/python-datalabeling/compare/v1.6.1...v1.6.2) (2022-10-03)
 
 
diff --git a/samples/snippets/requirements-test.txt b/samples/snippets/requirements-test.txt
index 6759e75..3bc76ce 100644
--- a/samples/snippets/requirements-test.txt
+++ b/samples/snippets/requirements-test.txt
@@ -1,2 +1,2 @@
-backoff==2.1.2
+backoff==2.2.1
 pytest==7.1.3
diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index 153bdcc..5087fcf 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -1 +1 @@
-google-cloud-datalabeling==1.6.1
+google-cloud-datalabeling==1.6.2
diff --git a/setup.py b/setup.py
index 802bc73..8cf6a98 100644
--- a/setup.py
+++ b/setup.py
@@ -21,12 +21,12 @@
 
 name = "google-cloud-datalabeling"
 description = "Data Labeling API client library"
-version = "1.6.2"
+version = "1.6.3"
 release_status = "Development Status :: 4 - Beta"
 dependencies = [
     "google-api-core[grpc] >= 1.32.0, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,!=2.5.*,!=2.6.*,!=2.7.*",
     "proto-plus >= 1.22.0, <2.0.0dev",
-    "protobuf >= 3.20.2, <5.0.0dev",
+    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 
 extras = {"libcst": "libcst >= 0.2.5"}
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index eb58105..12b4d14 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -8,4 +8,4 @@
 google-api-core==1.32.0
 libcst==0.2.5
 proto-plus==1.22.0
-protobuf==3.20.2
+protobuf==3.19.5